Near the surface of the Earth there is an electric field of about 150 V/m which points downward. Two identical balls with mass 0.346 kg are dropped from a height of 1.60 m , but one of the balls is positively charged with q1 = 500 μC , and the second is negatively charged with q2=-500 μC .

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

there are no contact forces mentioned on the list of choices that you've provided.

the ima (higher than 1m) will be greater than the ima with the height of 1m.